USB power bank



FIG. 1 is a TOP RIGHT PERSPECTIVE view of a USB power bank, showing my new design;

FIG. 2 is a FRONT ELEVATION view thereof;

FIG. 3 is a BACK ELEVATION view thereof;

FIG. 4 is a LEFT ELEVATION view thereof;

FIG. 5 is a RIGHT ELEVATION view thereof;

FIG. 6 is a TOP PLAN view thereof; and,

FIG. 7 is a BOTTOM PLAN view thereof.

The broken lines shown in the drawings are included for the purpose of illustrating portions of the article which form no part of the claimed design. 

CLAIM The ornamental design for a USB power bank, as shown and described. 